mm: use refcounts for page_lock_anon_vma()

[pandora-kernel.git] / mm / migrate.c

diff --git a/mm/migrate.c b/mm/migrate.c
index 34132f8..e4a5c91 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -721,15 +721,11 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
                 * Only page_lock_anon_vma() understands the subtleties of
                 * getting a hold on an anon_vma from outside one of its mms.
                 */
-               anon_vma = page_lock_anon_vma(page);
+               anon_vma = page_get_anon_vma(page);
                if (anon_vma) {
                        /*
-                        * Take a reference count on the anon_vma if the
-                        * page is mapped so that it is guaranteed to
-                        * exist when the page is remapped later
+                        * Anon page
                         */
-                       get_anon_vma(anon_vma);
-                       page_unlock_anon_vma(anon_vma);
                } else if (PageSwapCache(page)) {
                        /*
                         * We cannot be sure that the anon_vma of an unmapped
@@ -857,13 +853,8 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
                lock_page(hpage);
        }
 
-       if (PageAnon(hpage)) {
-               anon_vma = page_lock_anon_vma(hpage);
-               if (anon_vma) {
-                       get_anon_vma(anon_vma);
-                       page_unlock_anon_vma(anon_vma);
-               }
-       }
+       if (PageAnon(hpage))
+               anon_vma = page_get_anon_vma(hpage);
 
        try_to_unmap(hpage, TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS);